To move a number to the other side of the equation, you must

you must do the same thing on both sides

Step-by-step explanation:

example:

say you have the following equation:

5+X=10

you will subtract 5 from both sides of the equation

5+X-5=10-5 ---> X=5

If your dealing with Multiplication or division, it's still the same concept

say 5X=10 you will then divide BOTH SIDES by 5 to solve for X

5X / 5 = 10/5 ---> X=2

HOPE THIS HELPS!